The lowest levels of a programming language's library functions are always obscure and often have no code that looks like it even remotely does anything. Some languages have these functions like getting substrings, converting between data types, querying a variable's data type, and so forth implemented as part of their standard libraries, but I can't imagine how these low-level functions can be expressed using said language. How are these things achieved? I'm not asking for how it is done with all languages, but rather what the general method of doing this is conceptually.
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